Is this problem related to MakeMKV or to the Blu Ray Disc?

[anothergene]

Backup options:
--decrypt
Decrypt stream files during backup. Default: no decryption.

(However, under the GUI, "Decrypt" is set as the default.)

See I told you it was sure to happen eventually.

Thanks again, I ran across that late last night.

[setarip_old]

Thanks again, I ran across that late last night.

You're quite welcome ;>}